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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff5138946f1f6eb5026c5f5e0eb25b7106fe547c6b8f3e0b162baa5af028ac1' 
  AND token = 'wPoH1r45PC70i4FvAjcQlazgkQ9cn3SM6FTYkqceQME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}